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Homework Help: Hockey and Physics

  1. Nov 14, 2008 #1
    Hockey and Physics!!

    1. The problem statement, all variables and given/known data

    So im good at hockey, but just not the physics aspect:tongue:. Could someone please check my answers and provide feeback

    A hockey player is standing on his skates on a frozen pond when an opposing
    player skates by with the puck, moving with a constant speed of 12 m/s. After
    3.0 s, the first player makes up his mind to chase his opponent and starts
    accelerating uniformly at 3.8 m/s^2.
    (a) How long does it take him to catch his
    (b) How far does he travel before he catches up with his opponent?

    2. Relevant equations

    3. The attempt at a solution

    Opposing skater is moving with constant velocity, a = 0 , v= 12m/s

    After the 1st player starts and moves with an accleration of 3.8 m/s^2 after 3 seconds.

    v= u+at = 3.8x3 = 11.4 m/s

    Let "t" be the time in which the first player catches his opponent.

    Within this time, the opponent moves a distance of s= ut= 12t m

    therefore, the 1st player-> s= 1/2 a t^2 = 1.9t^2

    12= 1.9t
    t= 6.315 seconds

    b) the distance travelled during this time period to catch his opponent is:

    s= 1.9t^2= 1.9 (6.315)^2 = 75.77 m
  2. jcsd
  3. Nov 14, 2008 #2


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    Homework Helper

    Re: Hockey and Physics!!

    What is the equation for the first player?

    x = 3*12 + 12*t

    What is the equation for the guy starting out?

    x = 1/2*a*t2

    When the x is the same that will be the time.
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